acanthaceous

from The Collaborative International Dictionary of English v.0.48

Acanthaceous \Ac"an*tha"ceous\, a.
   1. Armed with prickles, as a plant.
      [1913 Webster]

   2. (Bot.) Of, pertaining to, or resembling, the family of
      plants of which the acanthus is the type.
      [1913 Webster]